Android ListView:不执行覆盖原因滚动
我想知道用户是向上还是向下滚动。 我已经开始覆盖Android ListView:不执行覆盖原因滚动,android,listview,scroll,overriding,Android,Listview,Scroll,Overriding,我想知道用户是向上还是向下滚动。 我已经开始覆盖OnGetureListener.onScroll()方法,并为ListView设置我的GestureDetector public class ContactList extends ListView { GestureDetector gestureDetector; public ContactList(Context context) { super(context); initView(
OnGetureListener.onScroll()
方法,并为ListView
设置我的GestureDetector
public class ContactList extends ListView {
GestureDetector gestureDetector;
public ContactList(Context context) {
super(context);
initView();
}
public ContactList(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
public ContactList(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
private void initView() {
gestureDetector = new GestureDetector(new SimpleOnGestureListener() {
public boolean onScroll(MotionEvent firstEvent, MotionEvent secondEvent, float distanceX, float distanceY) {
Log.d("tag", "onScroll "+firstEvent.getAction());
Log.d("tag", "onScroll "+secondEvent.getAction());
return true;
};
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
}
调试时,我注意到它是从onTouchEvent()传递的,而不是从onScroll()传递的,并且滚动不再由列表视图执行
public class ContactList extends ListView {
GestureDetector gestureDetector;
public ContactList(Context context) {
super(context);
initView();
}
public ContactList(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
public ContactList(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
private void initView() {
gestureDetector = new GestureDetector(new SimpleOnGestureListener() {
public boolean onScroll(MotionEvent firstEvent, MotionEvent secondEvent, float distanceX, float distanceY) {
Log.d("tag", "onScroll "+firstEvent.getAction());
Log.d("tag", "onScroll "+secondEvent.getAction());
return true;
};
});
}
@Override
public boolean onTouchEvent(MotionEvent event) {
return gestureDetector.onTouchEvent(event);
}
}
我做错了什么
谢谢您是否尝试过在onTouchEvent
方法中调用super.onTouchEvent(event)
Edit-我想您也希望在onScroll
方法中返回false
那么您的ontochevent
方法应该是:
@Override
public boolean onTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return true;
}
return super.onTouchEvent(event);
}
杰出的在onScroll()
中返回false
表示事件未被使用,因此onTouchEvent()
可以将事件转发到超类。它起作用了。非常感谢!:)